WO2010143832A2 - Tip for excavator bucket and method for manufacturing same - Google Patents

Abstract

The present invention relates to a method for manufacturing a tip for an excavator bucket, comprising: (a) a step of producing a core from an alloy steel; (b) a step of forming a main body including a wedge-shaped front end portion, a rear end portion to be coupled to teeth of the bucket, and a coupling portion formed from the rear end portion toward the front end portion; and (c) a step of fitting and coupling the core produced in step (a) to the coupling portion of the main body formed in step (b).

Description

Excavator bucket tip and manufacturing method

The present invention relates to an excavator bucket tip used in an excavator, which is one of construction equipment, and a method of manufacturing the same, and more particularly, the bucket tip and the bucket tip, which are the first points at which the excavator begins to be excavated, are easily manufactured. It is about how to.

Representative examples of excavators include bulldozers and excavators. Among them, bulldozers are used not only for excavation, but also for various purposes such as clearing, snow removal, and stoppage. Excavators are used for excavation, digging, excavation, excavation, digging and excavation It is a 'construction machine' that performs work such as work, stop work to clean up the ground, and is composed of a traveling body that plays a role of equipment, and an upper swinging body and a working device that rotates 360 degrees.

Excavators are categorized into crawler crawler excavators and tire wheeled excavators according to the driving method of the traveling body. Since crawler excavators are more stable and more productive than wheeled excavators, they are widely used in each job site, ranging from 1 ton to 100 tonnes or more. Due to its low stability during work, it is possible to travel on the road without moving trailers, and is mainly used for work sites that require frequent work and movement.

Excavators can also be used with appropriate work equipment, depending on the soil and rock conditions, the type and purpose of the work. Buckets for general excavation and excavation of soil, breakers for crushing hard grounds and rocks, and crushers for dismantling and crushing buildings, etc. are mainly used for excavators.

Another equipment is loader equipment, which is used to load excavated soil, aggregates, crushed rock and grains into conveying machines.

When the excavator and the loader directly dig the ground and move the soil, gravel, etc., it is equipped with a bucket, and the tip is mounted at the end of the bucket. The wear progresses rapidly due to the friction of the repetitive operation. Due to these working characteristics, bucket tips require wear resistance and high toughness.

Conventional tips that have been commonly used have been manufactured from alloy cast steel and used in buckets. The method of attaching the tip to the bucket is a method of directly welding the bucket and the tip, using a bolt and a nut, or connecting the bucket and the tip with an adapter, which is connected between the bucket and the tip, and then fixing it with a pin.

At this time, since welding is required for welding, both the bucket and the tip should have a low carbon equivalent (the equivalent of carbon increase in terms of the effect of the alloying element on the carbon cracking). The welding quality is good. Therefore, if the welding method is applied, the chemical composition of the alloy cast steel should be adjusted in the manufacturing process of the tip to have good weldability and wear resistance and high toughness.

However, from experiences that have been used so far, carbon equivalents are unlikely to exceed 1.2. In order to increase wear resistance in cast steel products, high carbon content or high alloying content should be included, which makes welding difficult and cannot be an alternative.

As a result, other alternative methods include bolting and nut fastening, or the adapter is welded to the bucket and the adapter and tip are fixed with pins. Instead, the fastening method is applied.

However, even in the fastening method, the wear resistance of the tip did not progress much. The carbon equivalent of the alloy cast steel did not exceed 1.2, and the carbon content was controlled to 0.5 wt% or less.

Alloy cast steel of such a component combination can be obtained more improved wear resistance through the heat treatment process. The cast product before heat treatment has a soft base structure and cannot obtain a high hardness structure such as cementite (Fe ₃ C), but a high hardness structure can be obtained through a heat treatment process. In the heat treatment process, the cast steel is heated and maintained in an austenite region and then quenched to transform the matrix structure into martensite structure, thereby obtaining high hardness.

At this time, when the carbon equivalent is 1.2 or less and the carbon content is 0.5 wt% or less, it is possible to secure about HRC ('Hardness Rockwell C', hardness unit used when a 150 kg load is tested with a diamond intender). It can be seen that the performance and manufacturing process. However, these products are also used in excavation work in the work environment, such as Seoksan, the tip life of the tip is very short, even in the large tip is in the reality of replacing the tip after about 50 hours.

And the improved method due to such a short life is an example used by brazing (brazing) alloy steel, tool steel, and the like material having excellent wear resistance on the surface of the tip. In addition, the use of brazing wear-resistant materials is an advanced technology to secure both wear resistance and high toughness at the same time. However, there was a weak point that the bonding strength of the brazing surface was reduced and the bonding material fell off during use.

As another method, a wear resistant material was welded on the surface of the tip.

In addition, there are many types of welding electrodes for abrasion resistance, but among them, the used cemented carbide (wound tungsten) may be used to be crushed after welding, but it is expensive except for the special case. This is not universal.

Patent No. 10-0783100 discloses an "excavator bucket tip and its manufacturing method" has been disclosed to solve the above problems. 1 is a view showing a conventional excavator bucket, Figure 2 is a view showing a tip for the bucket.

As shown in FIG. 1, the conventional excavator bucket 10 includes a bucket body 20 having one surface open, a tip 30 directly contacting the ground, and a tip 30 at the body 20. Tooth 40 for attachment.

Here, the bucket tip 30 is made of alloy cast steel and has a wedge-shaped body including a pointed tip 31a and a rear end 31c having an insertion hole 31b into which the bucket tooth 40 is inserted. 31 and a seating hole 32 formed in the body 31 and formed from the tip end 31a of the body 31 toward the insertion hole 31b along its length direction, and the seating hole. It is attached to the hole 32 and includes a core 33 made of a wear-resistant material.

The body 31 is manufactured by a casting method using a mold, and the core 33 is fixed to the mold and fixed to the body 31 while the body 31 is cast. The seating hole 32 is a portion to which the core 33 is fixed while the body 31 is cast. That is, by affixing the core 33 when manufacturing a conventional tip for excavator buckets, it is possible to remarkably prevent wear of the tip for buckets.

However, the conventional excavator bucket tip 30 has a problem that the core 33 is not firmly fixed to the seating hole 32 when casting the body 31 due to the difference between the components of the body 31 and the core 33. When working with an excavator equipped with a tip for such a bad bucket, the efficiency of the work decreases, and a safety problem may occur.

Moreover, when the core is worn out due to the use of the excavator, the entire tip of the bucket 10, including the worn core 33, needs to be replaced, resulting in a large maintenance cost.

The present invention is to solve the conventional problems as described above, an object of the present invention to provide a tip and a manufacturing method for an excavator bucket excellent in wear resistance and high toughness.

That is, the present invention can greatly improve the fixability of the core and the bucket tip by inserting the core and the tip of the bucket tip from the body end to the front end, and the maintenance can be performed because only the core is replaced from the bucket tip when the core wears It is easy.

In order to achieve the above object, the tip manufacturing method for an excavator bucket of the present invention comprises the steps of: (a) manufacturing a core from alloy steel; (b) forming a body comprising a wedge-shaped tip, a rear end coupled to the teeth of the bucket, and a coupling portion formed in the direction of the front end from the rear end; And (c) inserting the core manufactured by the step (a) into the coupling portion of the body formed in the step (b).

The coupling part is a coupling hole formed to penetrate from the rear end portion to the tip end portion, or a coupling groove formed by recessing in the direction of the tip end portion at the rear end portion, or a coupling groove formed by recessing in the direction of the rear end portion at the tip end portion. .

The step (a) further includes the step of heat-treating the core.

The step (b) further includes the step of heat-treating the body.

The step (c) further includes the step of heat-treating the body to which the core is coupled.

The step (b) further includes a step of precisely machining the inner circumferential surface of the coupling hole or the coupling groove of the body for coupling the core.

Here, the core is made of one of a cylindrical, triangular, rectangular, and polygonal shape, and the coupling part is formed in the same shape as the core.

The body has a carbon content of 0.1wt% to 0.5wt% and includes silicon, manganese, nickel, chromium, molybdenum, copper, aluminum, vanadium, boron and iron.

The body is heated and maintained in the austenite region during the heat treatment process and then quenched to transform the matrix into martensite tissue, the internal hardness of HRC 30 to 55, the heating temperature is 850 ℃ ~ 1200 ℃ Tempering is performed at 150 ° C to 500 ° C.

The core is made of alloy steel having a higher wear resistance or hardness (hardness of HRC 56 or more) than the body.

The core is formed to be 0.5% to 30.0% longer than the depth of the coupling hole or the coupling groove so as to project outward from the front end of the body.

The core is made of alloy steel composed of 0.6% to 1.5% Mo, 9.0% to 15.0% Cr, 0.9% to 2.0% C, 0.05% to 0.50% V, and 10% to 85% Fe.

When the core is selected as cold tool steel for impact, the heat treatment process is maintained at 920 ° C. to 1050 ° C., the tempering temperature is 150 ° C. to 580 ° C., and the hardness value is HRC 56 to 64.

One or more of the contact surfaces corresponding to each other of the core and the coupling portion form an inclined surface gradually inclined upward from the front end portion to the rear end portion of the body.

Wherein the step (c) further includes forming a shock absorbing member between at least one of the contact surfaces corresponding to each other of the core and the coupling portion.

The shock absorbing member is manufactured by mixing any one or more of metals, nonmetals, fibers, ceramics, polymers, organic compounds, and inorganic compounds.

The shock absorbing member is formed in one of powder, paste, thin plate, fiber, and wire.

Wherein the step (b) forms the body in a casting or forging process.

The tip for the excavator bucket manufactured by the manufacturing method as described above has a wedge-shaped tip, a rear end coupled to the teeth of the bucket, and a coupling part formed in the direction of the front end at the rear end or in the direction of the rear end at the front end. One body; And an alloy steel core coupled to the coupling portion of the body.

The core is manufactured in one of cylindrical, triangular, rectangular, and polygonal shapes, and the coupling part is formed in the same shape as the core.

The coupling portion of the body is a coupling hole formed to penetrate from the rear end portion to the tip portion, or a coupling groove formed by being recessed from the tip portion to the rear end portion.

The core is fitted to the coupling portion of the body is coupled to, and is formed to be 0.5% ~ 30.0% longer than the depth of the coupling portion to protrude outwardly from the tip portion.

One or more of the contact surfaces corresponding to each other of the core and the coupling portion form an inclined surface gradually inclined upward from the front end portion to the rear end portion of the body.

An impact absorbing member is formed between at least one of the contact surfaces corresponding to the core and the coupling portion.

As described above, by manufacturing the tip of the excavator bucket using the method for manufacturing the tip of the excavator bucket of the present invention, it is possible to greatly improve the firm and stable bonding of the core and the bucket tip, can be replaced when the core wear Since there is an effect that can improve the commerciality and efficiency.

The present invention is not limited to the described embodiments, and various modifications and changes can be made to those skilled in the art without departing from the spirit and scope of the present invention. Such modifications or modifications are described in the present invention. It belongs to the claims of the.

1 is a perspective view showing a tip for a conventional excavator bucket.

Figure 2 is a cross-sectional view showing a tip for a conventional excavator bucket.

Figure 3 is a side cross-sectional view showing a tip for an excavator bucket according to the first invention.

Figure 4 is a plan sectional view showing a tip for an excavator bucket according to the first invention.

Figure 5 is a flow chart showing a manufacturing method of the tip for the excavator bucket according to the first invention of the present invention.

Figure 6 is a block diagram showing a manufacturing method of the tip for the excavator bucket according to the first invention of the present invention.

Figure 7 is a cross-sectional view showing a tip for an excavator bucket according to the second invention.

Figure 8 is a block diagram showing a manufacturing method of the tip for the excavator bucket according to the second invention.

Figure 9 is a cross-sectional view showing the tip for the excavator bucket according to the third invention.

Figure 10 is a plan sectional view showing a tip for an excavator bucket according to the third invention.

Figure 11 is a plan sectional view showing a tip for an excavator bucket according to the fourth invention.

12 is a plan sectional view showing a tip for an excavator bucket according to the fifth invention;

Hereinafter, a tip for an excavator bucket of the present invention and a manufacturing method thereof will be described in detail with reference to FIGS. 3 to 12.

In the description of the present invention, the same reference numerals are used for the same reference numerals as the above-described conventional constructions and functions, and redundant descriptions thereof will be omitted.

Excavator bucket of the present invention includes a bucket body having an open surface, a tooth formed on the bucket body, and a tip for a bucket coupled to the tooth and directly hit the ground. Here, the bucket body and teeth have the same configuration and function as the bucket body 20 and the teeth 40 described in the prior art (see FIGS. 1 and 2), and thus detailed description thereof will be omitted.

[First invention]

3 is a view showing a tip for a bucket according to the first invention.

Bucket tip according to the present invention is the configuration of the main technical configuration of the present invention to improve the wear resistance, hardness and toughness.

That is, the bucket tip 100 of the present invention, as shown in Figures 3 and 4, the body 110 forming the outer shape of the tip, and the core 120 to reinforce the wear resistance and hardness of the body 110 ).

The body 110 hits the ground directly, the front end portion 111 having a wedge shape so that the land can be sold more easily, and a seating groove formed in the direction of the front end portion 111 to be coupled to the teeth of the bucket (not shown) A rear end portion 113 formed with the 112, and a coupling portion formed in the direction of the front end portion 111 in the rear end 113.

Here, the coupling portion is a coupling hole 114 formed to penetrate in the direction of the front end portion 111 from the rear end 113, the front end portion 111, the rear end 113 and the coupling hole 114 when casting or forging Is manufactured integrally.

The core 120 is to reinforce the wear of the body 110, is made in the form of one of the rods of circular, triangular, square, polygonal shape, the coupling hole 114 is the same shape as the core 120 Is formed.

Here, the core 120 is preferably formed to be 0.5% to 30.0% longer than the depth of the coupling hole 114 to protrude outward from the front end portion 111 of the body 110, which is a bucket tip 100 In order to lower the wear of the body 110 by hitting the core 120 to the ground before the body 110, and to significantly extend the use cycle of the tip for the bucket.

The manufacturing method of the bucket tip which concerns on 1st invention which has such a structure is demonstrated in detail.

As shown in FIGS. 5 and 6, the method for manufacturing the bucket tip according to the first invention includes a process of manufacturing a core from alloy steel having high wear resistance and hardness (hardness of HRC 56 or higher) (S10), and a body 110. ) And a step (S30) of fitting the core 120 produced through the S10 process to the body (110) cast through the S20 process by casting the (S20).

In more detail, the core fabrication process (S10) fabricates the core 120 using alloy steel having better wear resistance and hardness than the body 110 (see FIG. 6A).

That is, the wear resistant core 120 includes high carbon steel, chromium steel, chromium molybdenum steel, nickel chromium steel, nickel chromium molybdenum steel, bearing steel, spring steel, stainless steel, heat resistant steel, tool steel, high chromium steel, and cemented carbide. Here, the tool steel includes carbon, carbon-vanadium steel, cold working steel, impact resistant steel, thermal steel, and high speed steel, and the core 120 may be manufactured using one of the tool steels. In the case of selecting the tool steel when the core 120 is manufactured, it is preferable to manufacture by one of casting, powder metallurgy, and spray molding.

In addition, the raw material of the core 120 has a form of one of a plate, a horn, a round bar, and the raw material is cut or machined to produce a cylindrical, plate-shaped, round bar, triangle, square and polygonal form. .

Meanwhile, the core 120 has Mo (molybdenum) of 0.6% to 1.5%, Cr (chromium) of 9.0% to 15%, C (carbon) of 0.9% to 2.0%, and V (vanadium) of 0.05% to 0.5. %, And Fe (iron) can be made of alloy steel consisting of 10% to 85%.

In this case, the S10 process may further include a heat treatment process for increasing mechanical properties such as high rigidity and high wear resistance of the core 120.

That is, in the core heat treatment process, the temperature for heating with austenite during heat treatment is 850 ° C. to 1200 ° C., thereby heating the core 120 through the temperature to increase mechanical properties.

On the other hand, when the core 120 is selected as impact cold tool steel, the heat treatment process is austenitic heating holding temperature of 920 ℃ ~ 1050 ℃, tempering (tempering) temperature is carried out at 150 ℃ ~ 580 ℃, hardness Set the value to HRC 56 ~ 64.

While performing the core manufacturing process (S10) in the same manner as described above, the process of forming the body 110 having a tip shape for the bucket is carried out at the same time.

The body forming step (S20) is from the rear end 113, and the rear end 113 formed a wedge-shaped front end portion 111, a seating groove 112 is coupled to the teeth (not shown) of the bucket. A mold or mold 200 for forming a body 110 including a coupling hole 114 formed to penetrate to the front end 111 is manufactured, and the body 110 is formed by a casting or forging method. 6 (b) shows a method of forming the body 110 by casting, injecting a molten alloy alloy steel into the mold 200 to cast the body 110.

Here, the body 110 has a carbon content of 0.1wt% to 0.5wt%, and includes silicon, manganese, nickel, chromium, molybdenum, copper, aluminum, vanadium, boron, and iron.

That is, the body 110 contains a total of carbon, silicon, manganese, nickel, chromium, and molybdenum, copper, aluminum, vanadium, and boron within 6 wt%, and the rest contains iron.

The body 110 may be manufactured by a casting method using an alloy cast steel, wherein the casting method and the core manufacturing method of the casting method is a green mold method, a thermosetting mold shell mold (shell mold) method, a hard mold (self) mold Sodium silicate process of phosphorus inorganic mold, Pepsi, phenol, furan molding, and inorganic mold of gas hardening mold, CO ₂ , VRH (vacuum value environment) process, cold box process of organic mold, amine, SO ₂ , Ester, FRC Cold Box, Lost Wax, Ceramic Mold, Precision Casting, Lost Model Casting, Pressure Suction Casting.

The structure of the mold frame 200 in which the outer shape of the body 110 is to be formed is formed to be separated into the upper mold 210 and the lower mold 220, respectively, and the core hole 114 to which the above-described core 120 is coupled. In the position, the core 240 having the same shape as the core 120 is mounted inside the set mold 200.

In addition, the mold 200 has a cavity 230 in which the body 110 is to be formed, and an injection hole 250 for injecting molten alloy steel connected to the cavity, a ballway (not shown), and a taphole (not shown). , Hot water degassing hole (not shown) is included.

In addition, the cavity 230 in which the body 110 is to be formed may be formed in a plurality of molds 200, thereby manufacturing a plurality of bodies 110 at a time, thereby increasing the efficiency of manufacturing You can.

In addition, the molten alloy of the alloy can be dissolved through various induction methods used in the electric induction and casting industry. In addition, the molten metal is heated and maintained at 1550 ° C or more, and then poured into a mold, and the subsequent process manufactures the body 110 in the same manner as in a conventional casting process.

On the other hand, the body 110 in the present invention may also be formed in a forging, in this case, instead of the casting mold 200 shown in Figure 6 (b) to manufacture a conventional mold (not shown) suitable for hot forging Use it. In order to process the same structure as the body 110 by the forging method, the number of forgings is performed one or more times.

That is, after the forging is performed one or more times to form the overall appearance of the body 110, forging is further performed to form the coupling hole 114 or the coupling groove 114 '. In order to manufacture the body 110 by the above method, the prepared material is heated to a high temperature (1100 ° C ~ 1400 ° C), placed in the cavity of the mold, and subjected to plastic deformation by applying an impact load with a forging press. It is processed into the same structure as).

Thereafter, the core 120 is coupled to the coupling hole 114 or the coupling groove 114 'formed by forging.

Meanwhile, the S20 process may further include a heat treatment process for increasing mechanical properties such as high toughness and high wear resistance of the body 110 in the same manner as the core fabrication process (S10).

That is, the heat treatment process of the body 110 is heated and maintained in the austenite region during heat treatment and then quenched to transform the matrix structure into martensite structure to obtain a high hardness, the internal hardness is HRC 30 ~ 55, heating temperature is set to 850 degreeC-1200 degreeC, and tempering is performed at 150 degreeC-500 degreeC.

Thus, the matrix structure of the body 110 subjected to the heat treatment process shows a tempered martensite structure, the hardness of which can be obtained HRC 30 ~ 55, the chemical composition of the body 110 is less than 0.5wt% carbon The carbon equivalent is 1.2 or less.

As described above, the body 110 has a problem in that wear resistance is increased when hardness is increased, but toughness is decreased, and wear resistance is decreased when toughness is increased, and thus high wear resistance and high toughness can be simultaneously improved by performing heat treatment.

On the other hand, the S20 process further includes a process of precisely machining the coupling hole 114.

That is, in the precision machining process of the coupling hole 114, the body 110 is manufactured using the mold frame 200, so that not only an outer circumferential surface of the body 110 but also an irregular friction surface is formed in the coupling hole 114. Due to this irregular friction surface, the core 120 may not be smoothly coupled, and there is a problem in that the bondability is poor.

In order to prevent this, by removing the irregular friction surface formed inside the coupling hole 114 by using a hole processing device (not shown), the core 120 is forcibly fitted into the coupling hole 114 to be fitted or smoothly fitted. It is possible to combine the same, and also improve the adhesion by improving the adhesion.

When the body manufacturing process (S20) is completed in the same manner as described above, the core 120 manufactured through the core manufacturing process (S10) is inserted into the coupling hole 114 of the body 110 to be coupled ((c) of FIG. 6. ) Reference).

That is, the core 120 is coupled by inserting the core 120 in the direction of the tip portion 111 from the coupling hole 114 formed in the rear end portion 113 of the body 110, wherein the tip of the core 120 is the tip portion of the body 110 ( 111) It is good to combine so as to protrude from 1 to 30mm in the outward direction.

In this way, in order for the core 120 to protrude from the body 110, the core 120 is formed to be 0.5% to 30.0% longer than the depth of the coupling hole 114 at the time of manufacture.

In more detail, as shown in Figure 4, from the front end surface (A) of the body 110 to the inner wall surface (B) of the seating groove 112 is referred to as the wear limit electric field (C) of the body, the core ( When the length of 120) is referred to as the wear limit length (D) of the core, if the wear limit length (D) of the core is equal to or larger than the wear limit length (C) of the body, the service life of the tip for the bucket is determined. It can be extended.

In other words, the service life of the bucket tip is extended by the difference between the wear limit length D of the core and the wear limit length C of the body.

When the coupling process of the core and the body (S30) is completed in the same manner as described above, a tip for an excavator bucket is manufactured (see FIG. 6 (d)).

Hereinafter, in describing other embodiments or inventions according to the present invention, the same reference numerals are used for the same components, operations, and functions as those of the first invention, and overlapping descriptions are omitted.

[Other Embodiments of Heat Treatment]

This embodiment shows another embodiment of the heat treatment of the core 120 and the body 110 carried out in the first invention, in the state in which the body 110 and the core 120 are manufactured, respectively, without performing heat treatment , Heat treatment is performed in a state where the coupling of the core 120 and the body 110 is completed through the S30 process.

Here, the heat treatment in the state where the coupling of the core 120 and the body 110 of the present embodiment is completed is the same as the process of heat-treating the core 120 and the body 110, respectively, in the above-described S10 process or S20 process of the first invention. Since the heat treatment is performed by the method, redundant description is omitted. However, the heat treatment temperature of the body 110 to which the core 120 is coupled is preferably performed at austenite heating and holding temperature of 850 ° C to 1200 ° C, and tempering temperature of 150 ° C to 580 ° C.

Therefore, by simultaneously heat-treating the core 120 and the body 110 can shorten the work process can reduce the work efficiency, time and cost.

[2nd invention]

7 and 8 show the tip for the excavator bucket according to the second invention.

As shown in FIG. 7, the tip 100 ′ of the excavator bucket tip according to the second invention has a tip groove 111 and a seating groove 112 formed in a direction of the tip portion 111 so as to be coupled to a tooth (not shown) of the bucket. A body 110 'having a rear end portion 113, and a coupling portion formed in the direction of the front end portion 111 at the rear end 113, and a core fitted to and coupled to the coupling portion of the body 110'. 120.

Here, the coupling portion is formed in the direction of the front end portion 111 in the rear end portion 113 of the body 110 ', as shown in Figure 7, that is, the coupling groove 114' is opened only in the rear end portion 113 direction. The core 120 is fitted into the body 110 'through a coupling groove 114' formed at the rear end 113 and coupled thereto.

Referring to the manufacturing method of the excavator bucket tip (100 ') having such a configuration, as shown in Figure 8, the process of producing a core 120 from alloy steel with high wear resistance and hardness (S10) (a)), a wedge-shaped tip 111, a rear end 113 coupled to the teeth of the bucket, and a coupling groove 114 'formed in the direction of the tip 111 at the rear end 113. Producing a mold (200 ') for casting the body (110') including, and injecting molten alloy alloy steel into the mold (200 ') casting the body (110') (S20) (Fig. 8 (b)), a step (S30) (see Fig. 8 (c)) by fitting the core 120 produced through the S20 process to the coupling portion of the body 110 'cast through the S10 process. It consists of, it can be produced through the tip for the bucket tip 100 '(see Fig. 8 (d)).

On the other hand, the manufacturing method of the tip for the excavator bucket of the second invention is only different with respect to the mold (200 ') is mounted on the core 240' having the shape of the coupling groove 114 'for the first invention. Since all processes and effects are the same as those of the first invention, redundant descriptions are omitted. The forging process described in the first invention can be equally applied to the second invention.

[Third invention]

9 and 10 show the tip for the excavator bucket according to the third invention.

The tip 100 ″ for the excavator bucket according to the third invention is a technique showing another embodiment of the core 120 and the body 110 of the first invention described above.

As shown in FIGS. 9 and 10, the tip 100 ″ for the excavator bucket 100 according to the third invention has a contact surface corresponding to at least one of the contact surfaces corresponding to the coupling portions of the core 120 ″ and the body 110 ″. An inclined surface gradually inclined upward from the front end portion 111 of the body 110 ″ toward the rear end 113 (see the core shape of FIGS. 9 and 10).

That is, the core 120 "may measure the length of the rear end (" F "shown in FIG. 9 or" H "shown in FIG. 10) rather than the length of the front end (" E "shown in FIG. 9 or" G "shown in FIG. 10). At least one side, preferably all sides, is formed in an inclined tapered shape.

Here, although the coupling portion of the body (110 ") has been described and illustrated as an example in the coupling hole 114" in the present invention, the coupling groove instead of the coupling hole 114 "according to the tip for the excavator bucket is applied is equally applicable. .

Therefore, the core 120 "and the coupling part (coupling hole 114") incline at least one of the surfaces closely contacted to increase the rigid assembly of the core 120 "from the coupling part, and improve the stability of the work. Can be improved.

That is, the conventional tip 30 for excavator buckets (see FIG. 2) has a flat surface contact force between the body 31 and the core 33, and thus, due to the weakening of the adhesive force when the core 33 is coupled or when the tip for the bucket is used. The core 33 is separated out of the body 31, thereby deteriorating the quality of the bucket tip and the continuity of the work was poor.

In order to solve such a problem, the third invention may prevent the core from being separated by improving the quality of the bucket tip and the continuity of the work by forming the inclined contact surface of the core 120 ″ with the coupling part.

[4th invention]

11 is a view showing a tip for an excavator bucket according to the fourth invention.

As illustrated in FIG. 11, the tip 100 ″ for the excavator bucket according to the fourth invention has a tip groove 111 and a seating groove formed in the tip portion 111 direction so as to be coupled to a tooth (not shown) of the bucket ( A body 110 "'having a rear end portion 113 having a 112 formed therein, and a coupling portion formed in the direction of the rear end portion from the front end portion 111, and a core fitted to and coupled to the coupling portion of the body 110"'. (120 "').

Here, referring to FIG. 11, the coupling portion recessed in the direction of the rear end portion 113 from the front end portion 111 of the body 110 "', that is, the coupling groove 114" opened only in the direction of the front end portion 111 ". '), The core 120 "' is fitted into the body 110" 'through the coupling groove 114 "'.

Here, the shock absorbing member 130 for adhesion and shock absorption is further formed between one or more contact surfaces of the core 120 ″ ′ and the corresponding contact surfaces of the coupling groove 114 ′ ′.

The shock absorbing member 130 may be made of metal (copper, bronze, aluminum, copper alloy, iron, tin, zinc, etc.), nonmetal, fiber (glass fiber, carbon fiber or general fiber, etc.), ceramic (Al ₂ O ₃ , SiC, Si ₃ N ₄ , SiO ₂ , K ₂ O, MgO, CaO, R ₂ O ₂ , Cr ₂ O ₃ , ZrO ₂ , TiO _2, etc.), polymers, organic compounds, inorganic compounds or any one or more It is manufactured by using a metal or a non-metal, preferably in the wedge shape (the form in which the left side thickness is larger than the right side thickness in FIG. 11) (see FIG. 11).

That is, the shock absorbing member 130 is in close contact with the coupling portion and the core 120 "'when the process of coupling the core 120"' to the coupling portion of the body 110 "'is completed. The process of fitting the shock-absorbing member 130 made in the wedge shape is further performed between one of the contact surfaces.

Therefore, by fitting the shock absorbing member 130 to prevent the separation of the core (120 "') from the coupling portion can be a solid assembly.

On the other hand, the shock absorbing member 130, in addition to the method of producing a metal or non-metal in the form of a wedge, the powder (the particle size of the powder is less than 5mm) is produced in the form of the coupling portion and the core (120 "') After coating on each of the close contact surfaces, the same effect as described above can also be obtained by fitting the coupling portion and the core 120 "'to which the shock absorbing member 130 is applied.

That is, the shock absorbing member 130 is made of metal, non-metal thin foil, plate, and wire in the form of wedges and fitted to the corresponding close contact surface of the core 120 "'and the coupling groove 114"'. It is used in the form of a powder or paste, or applied to each of the corresponding close contact between the core 120 "'and the coupling groove 114"', or soldering or plating (core, nickel) on the core , Chromium, zinc, tin, aluminum, or the like, or by brazing on a corresponding contact surface of the core 120 "'and the coupling groove 114"', or the core 120 "' And an organic or inorganic compound may be used by painting on the contact surfaces corresponding to the coupling grooves 114 "'.

As such, the tip 100 ″ ′ for the excavator bucket according to the fourth invention further includes an impact absorbing member 130 on a close contact surface of the core 120 ″ ′ and the coupling groove 114 ′ ′. It is possible to increase the adhesion and the pressure input of the (120 "') and the body (110"') enables a solid assembly of the core (120 "') when using an excavator.

[5th invention]

12 is a view showing a tip for an excavator bucket according to the fifth invention.

The tip 100 ″ ″ for an excavator bucket according to the fifth invention is a technique showing another embodiment of the core 120 ″ ′ and the body 110 ″ ′ of the fourth invention described above.

That is, the tip 100 ″ ″ for the excavator bucket according to the fifth invention corresponds to the mutual coupling of the coupling groove 114 ″ ″ formed in the core 120 ″ ″ and the body 110 ″ ″ as shown in FIG. 12. One or more of the contact surfaces of the contact surfaces form an inclined surface gradually inclined upward from the leading end of the body (110 "") to the rear end.

That is, as shown in FIG. 12, the core 120 ″ ″ and the coupling groove (“I” shown in FIG. 12) of the core 120 ″ ″ and the contact groove 114 ″ ″ are in contact with each other. 114 ""), the length of the rear end ("J" shown in FIG. 12) is large, and at least one or more sides, preferably all sides are formed in inclined taper shape.

On the other hand, since the inlet of the tapered core 120 "" is small inlet of the tapered-shaped coupling groove 114 "", the taper-shaped core 120 "" is combined by a method such as fitting or press-fitting, and the core 120 "" and the coupling groove Once the engagement of the 114 "" is completed, a solid assembly of the core 120 "" is possible.

Although the present invention has been described in detail, the scope of the present invention is not limited thereto, and the basic concept of the present invention as defined in the following claims or various modifications and improvements are also indicated to be within the scope of the present invention.

Claims (28)

(a) manufacturing a core from alloy steel; (b) forming a body comprising a wedge-shaped tip, a rear end coupled to the teeth of the bucket, and a coupling portion formed in the direction of the front end from the rear end; And (C) a method for manufacturing a tip for an excavator bucket comprising the step of engaging by inserting the core produced through the step (a) to the coupling portion of the body formed in the step (b). The method according to claim 1, The coupling part is a tip manufacturing method for an excavator bucket consisting of a coupling hole formed to penetrate from the rear end to the front end. The method according to claim 1, The coupling portion is a tip manufacturing method for an excavator bucket consisting of a coupling groove formed by recessing in the direction of the front end portion from the rear end. The method according to claim 1, The coupling portion is a tip manufacturing method for an excavator bucket consisting of a coupling groove formed by recessing in the direction of the rear end portion from the front end. The method according to claim 1, The method (a) is a tip manufacturing method for an excavator bucket further comprising the step of heat-treating the core. The method according to claim 1, The step (b) is a method for manufacturing a tip for an excavator bucket further comprising the step of heat-treating the body. The method according to claim 1, The step (c) is a method for producing a tip for an excavator bucket further comprising the step of heat-treating the body to which the core is coupled. The method according to any one of claims 2, 3 and 4, Wherein (b) is a method for manufacturing a tip for an excavator bucket further comprises the step of precisely machining the inner peripheral surface of the coupling hole or the coupling groove of the body for the coupling of the core. The method according to any one of claims 1 to 7, The core is made in the form of a cylinder, triangle, square, polygonal form, The coupling portion is a tip manufacturing method for an excavator bucket is formed in the same shape as the core. The method according to any one of claims 1 to 7, The body has a carbon content of 0.1wt% to 0.5wt%, silicon, manganese, nickel, chromium, molybdenum, copper, aluminum, vanadium, boron and iron tip manufacturing method for an excavator bucket. The method according to claim 6, The body is heated and maintained in the austenite region during the heat treatment process and then quenched to transform the matrix into martensite tissue, the internal hardness of HRC 30 ~ 55, the heating temperature is 850 ℃ ~ 1200 ℃ The tempering is a tip manufacturing method for excavator buckets carried out at 150 ℃ to 500 ℃. The method according to any one of claims 1 to 7, The core is a method for producing a tip for an excavator bucket made of alloy steel having a higher wear resistance or hardness than the body (HRC 56 or more). The method according to claim 2 or 4, The core is a tip manufacturing method for an excavator bucket to form 0.5% to 30.0% longer than the depth of the coupling hole or the coupling groove so as to protrude outward from the front end of the body. The method according to any one of claims 1 to 7, The core is an excavator made of alloy steel composed of 0.6% to 1.5% Mo, 9.0% to 15% Cr, 0.9% to 2.0% C, 0.05% to 0.5% V, and 10% to 85% Fe. How to make a tip for a bucket. The method according to claim 5, When the core is selected as cold tool steel for impact, the heat treatment process is maintained at 920 ℃ ~ 1050 ℃, the tempering temperature is 150 ℃ ~ 580 ℃, and the hardness value is HRC 56 ~ 64. How to make a tip for a bucket. The method according to any one of claims 1 to 7, At least one of the contact surfaces of the core and the corresponding contact portion of the coupling portion is a tip manufacturing method for an excavator bucket to form a slope inclined gradually upward from the front end to the rear end of the body. The method according to claim 4, The step (c) is a method for producing a tip for an excavator bucket further comprising the step of forming a shock absorbing member between at least one of the contact surfaces of the core and the coupling portion corresponding to each other. The method according to claim 17, The shock absorbing member is a tip manufacturing method for an excavator bucket produced by mixing any one or more of metal, nonmetal, fiber, ceramic, polymer, organic compound, inorganic compound. The method according to claim 18, The shock absorbing member is powder, paste, thin plate, fiber, and a tip manufacturing method for an excavator bucket is formed in the form of one of the wire. The method according to any one of claims 1 to 7, The method (b) is a tip manufacturing method for an excavator bucket to form the body by a casting or forging process. Tip for an excavator bucket manufactured by the manufacturing method of claim 1. A body having a wedge-shaped tip, a rear end coupled to the teeth of the bucket, and a coupling part formed in the direction of the front end at the rear end or in the direction of the rear end at the front end; And Tip for excavator bucket comprising an alloy steel core coupled to the coupling portion of the body. The method according to claim 22, The core is made in the form of a cylinder, triangle, square, polygonal form, The coupling portion tip for the excavator bucket is formed in the same shape as the core. The method according to claim 22, The tip of the excavator bucket consisting of a coupling hole formed through the coupling portion of the body from the rear end to the front end. The method according to claim 22, The tip of the excavator bucket consisting of a coupling groove formed by recessed from the front end to the rear end of the coupling portion. The method according to claim 24 or 25, The core is fitted to the coupling portion of the body is coupled, the tip for the excavator bucket to form 0.5% ~ 30.0% longer than the depth of the coupling portion to protrude outward from the tip portion. The method of claim 26, At least one of the contact surfaces of the core and the engaging portion corresponding to each other is a tip for an excavator bucket to form an inclined surface gradually inclined toward the rear end from the front end of the body. The method of claim 26, Tip for the excavator bucket to form a shock absorbing member between the core and one or more of the contact surfaces of the corresponding contact portion mutually.

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